package PTA2.ti40;

import java.util.Scanner;

/**
 * @author Lenovo
 */
public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int n=scanner.nextInt();
        int maxHeight=0;
        for(int i=0;i<n;i++){
            int height= scanner.nextInt();
            if(height>maxHeight){
                maxHeight=height;
            }
        }
        System.out.println(maxHeight);

    }
}
